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<head>
    <meta charset="UTF-8">
    <title>源码对应电子书:百度"three.js 郭隆邦"</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
            /* 隐藏body窗口区域滚动条 */
        }
    </style>
    <!--引入three.js三维引擎-->
    <script src="http://www.yanhuangxueyuan.com/versions/threejsR92/build/three.js"></script>
    <!-- 引入threejs扩展控件OrbitControls.js -->
    <script src="http://www.yanhuangxueyuan.com/versions/threejsR92/examples/js/controls/OrbitControls.js"></script>
</head>

<body>
    <script>
        /**
         * 创建场景对象Scene
         */
        var scene = new THREE.Scene();
        /**
         * 创建网格模型
         */
        var geometry = new THREE.Geometry(); //声明一个几何体对象Geometry

        var p1 = new THREE.Vector3(50, 0, 0); //顶点1坐标
        var p2 = new THREE.Vector3(0, 70, 0); //顶点2坐标
        var p3 = new THREE.Vector3(80, 70, 0); //顶点3坐标
        //顶点坐标添加到geometry对象
        geometry.vertices.push(p1, p2, p3);

        // Color对象表示顶点颜色数据
        var color1 = new THREE.Color(0x00ff00); //顶点1颜色——绿色
        var color2 = new THREE.Color(0xff0000); //顶点2颜色——红色
        var color3 = new THREE.Color(0x0000ff); //顶点3颜色——蓝色
        //顶点颜色数据添加到geometry对象
        geometry.colors.push(color1, color2, color3);

        //材质对象
        var material = new THREE.LineBasicMaterial({
            // color: 0xffff00
            vertexColors: THREE.VertexColors, //以顶点颜色为准
        });
        //线条模型对象
        var line = new THREE.Line(geometry, material);
        scene.add(line); //线条对象添加到场景中


        // 辅助坐标系
        var AxesHelper = new THREE.AxesHelper(250);
        scene.add(AxesHelper);
        /**
         * 光源设置
         */
        //点光源
        var point = new THREE.PointLight(0xffffff);
        point.position.set(400, 200, 300); //点光源位置
        scene.add(point); //点光源添加到场景中
        //环境光
        var ambient = new THREE.AmbientLight(0x444444);
        scene.add(ambient);
        /**
         * 相机设置
         */
        var width = window.innerWidth; //窗口宽度
        var height = window.innerHeight; //窗口高度
        var k = width / height; //窗口宽高比
        var s = 150; //三维场景显示范围控制系数，系数越大，显示的范围越大
        //创建相机对象
        var camera = new THREE.OrthographicCamera(-s * k, s * k, s, -s, 1, 1000);
        camera.position.set(200, 300, 200); //设置相机位置
        camera.lookAt(scene.position); //设置相机方向(指向的场景对象)
        /**
         * 创建渲染器对象
         */
        var renderer = new THREE.WebGLRenderer();
        renderer.setSize(width, height); //设置渲染区域尺寸
        renderer.setClearColor(0xb9d3ff, 1); //设置背景颜色
        document.body.appendChild(renderer.domElement); //body元素中插入canvas对象

        // 渲染函数
        function render() {
            renderer.render(scene, camera); //执行渲染操作
        }
        render();
        //创建控件对象  相机对象camera作为参数   控件可以监听鼠标的变化，改变相机对象的属性
        var controls = new THREE.OrbitControls(camera, renderer.domElement);
        //监听鼠标事件，触发渲染函数，更新canvas画布渲染效果
        controls.addEventListener('change', render);
    </script>
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